6445661052 has 12 divisors (see below), whose sum is σ = 15039875816. Its totient is φ = 2148553680.

The previous prime is 6445661051. The next prime is 6445661111. The reversal of 6445661052 is 2501665446.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6445661052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445661051) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 268569199 + ... + 268569222.

Almost surely, 2^6445661052 is an apocalyptic number.

It is an amenable number.

6445661052 is an abundant number, since it is smaller than the sum of its proper divisors (8594214764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6445661052 is a wasteful number, since it uses less digits than its factorization.

6445661052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537138428 (or 537138426 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 39.

The square root of 6445661052 is about 80284.8743662217. The cubic root of 6445661052 is about 1861.0404873288.

The spelling of 6445661052 in words is "six billion, four hundred forty-five million, six hundred sixty-one thousand, fifty-two".